Unnecessary bump.
Nonetheless... despite what people have said, the time absolutely does matter, but that obviously depends on what subreddit you're targetting.
Take the average user of your subreddit. If there isn't one then assume American. Post when they're waking up. This is the time when the fewest people are posting and the most people are upvoting (around 7am)
Posting right now for example, is a lost cause. You COULD get a successful post, but it's much less likely.